语句，或可通过可视化操作
-- Create database link
create database link DBL_TEST
connect to UID identified by PSW
using '(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.XX.XX)(PORT = XXXX))
(CONNECT_DATA =
(SERVER = XXX)
(SERVICE_NAME = XX)
)
)';
在建了该 DB_LINK 的 用户下 执行表操作如：select * from sys_table@DBL_TEST 即可
